Rotary fan.



W. W.' ROSENFIEL D.

ROTARY FAN. APPLICATION mm JULY 1. 1912.

Patented. July 17, 1917.

WILLIAM w. nosnnrmmj, or nnw YORK, 1i. Y.

ROTARY FAN.

. eaver. 4

To all whom it may concern:

Be it known that 1, WILLIAM W. ROSEN- FIELD, a citizen of the United States, residing at New York city, county of New York, and State of New York, have invented certain new and useful Improvements in R0- tary Fans, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to rotary centrifugalfans, and the object of the invention is to improve the construction of such fans, and especially to provide a fan which shall be light in weight, strong and rigid, and of inexpensive construction, and shall have other advantages hereinafter referred to. The invention has been made especially with the idea of providing a fan suitable for use in suction cleaners of the self-contained type in which the motor, fan, suction nozzle and dirt receptacle are mounted to move together as the suction or cleaning nozzle is moved over the surface to be cleaned, and in which light weight combined with strength anddurability are essential. It is to be understood, however, that fans embodying the present invention may be aplied to any and all other uses for which it lsfound suitable.

A full understanding of the invention can best be given by a detailed description of a construction embodyin the same in an approved -form, and suc a description will now be given in connection with the accompanying drawings; in which.

Figure 1 is a longitudinal sectional view of a self-contained suction cleaner provided with a rotary fan made in accordance with the invention;

- Fig. 2 is a view of the fan removed from its shaft; and.

.Fig. 3 is a sectional view of the fan taken on line 33 of Fig. 2.

,Referring to the drawings, and firstto Fig. 1, 10 represents a rotary suction fan mounted to rotate about a horizontal axis in a fan casing 11, the fan being mounted on and driven by the shaft 12 of an electric motor 13 which is mounted in a sufpporting casing 14 extending rearwardly rom the fan casing. The front wall of the fan casing is formed with a central opening, and has secured to it a downwardly extending casing 15 providing an intake passage and Specification of Letters Patent. Application filed July 1, 1912. Serial No. 706,843.

Patelnlteol July 1,7, 191?.

charge passage 17 leads ofl? tan entially from the bottom of the fan cham er and communicates through a 'backwardly leading pipe 18 with a porous receptacle, 19 for recelving the dirt and dust discharged from the fan chamber. The receptacle 19 is hun'g from an operating handle rod 20 which is pivotally connected to.the rear end of the motor case to swing vertically and by which the suction cleaner is moved over the floor or surface to be cleaned. A pair of running wheels 21, of which one is shown in the drawings, serve with the nozzle 16 to suport the cleaner. The suction cleaner aside rom the fan itself forms no part of the present invention but is shown for the purmounted. When the blades of the fan are to extend radially outward the strips will be bent to V form, the angles between the two blades of each strip depending upon the number of blades with which the fan is to be provided. Adjacent blades of different strips are connected by means of strengthening pieces 26 preferably formed by metal sheets or webs as shown which are secured to the blades in any suitable manner as by means of edge flanges 28 soldered or otherwise secured to the blades. By connecting the adjacent blades of different strips in this manner an extremely strong and rigid construction is secured without anyconnection whatever between the two blades a and 7; of each strip. The most rigid construction is secured i by locating the strengthening piecesor webs intermediate the side edges of the blades, and to avoid any considerable interference with the action of the fan the webs are preferably positioned as shown nearer the rear edge than the front edge of the blades. It is of advantage also to have the strengthening webs end short of the 4 outer ends or edges of the blades since this I intermediate or bent portions of the strips' leaves the ends of theblades free to give or bend in the event of their striking any. obstruction which may become jammed in the fan casing, while at the same time the necessary rigidity of the blade is secured.

If the unsupported end of a blade should become bent, it may be easily straightened out again, whereas if the strengthening webs extended clear out to the ends of the blades an obstruction becoming caught within the fan casing might cause much greater dama e.

The bent blade strips may be secured to the hub in any suitable manner. A simple and strong way of securing them is shown in the drawing in which the V shaped bent strips are secured to the hub by screws, the

hub, a plurality of blades extending outwardly from the hub and formed of strips of sheet metal each bent to form two outwardly 'extendingblades and having their intermediate or bent portions secured to the hub, and strengthening pieces connecting adjacent blades of different strips, the space between adjacent blades of the same strip being left clear.

3. A rotary centrifugal fan comprising a hub, a plurality of blades eXtending out'-' wardly from the hub and formedby strips of sheet metal each bent to form two outwardly extending blades and having their intermediate or bent portions secured to the hub, and strengthening webs connecting adjacent blades of different strips.

4. A rotary centrifugal fan comprising a hub, a plurality of blades extending outwardly from the hub and formed by strips of sheet metal each bent to form two outplurality of radial blades formed 0 of sheet metal each bent to V-shape to form wardly extending blades and having their intermediate or bent portions secured to the hub, and strengthening webs connecting adjacent blades of different strips, said webs being located intermediate the -side edges of the blades.

5. A rotary centrifugal fan comprising a hub, a plurality ofradial blades formed by strips of sheet metal each bent to V shape to form two radial blades and having their intermediate or bent portions secured to the hub, and strengthening webs connecting adjacent blades of different strips, said strengthening webs ending short of the outer ends of the blades.-

6. A rotary centrifugal fan comprising a hub, and apluralityof radial blades formed of strips of sheet metal each bent to V shape to form two radial blades and having their intermediate or bent portions secured to the hub, said blades being provided with strengthening means. ending short of the outer ends of the blades.

7. A rotary fan comprising a hub and a f strips two radial blades and having their intermediate or bent portions secured to the hub, said blades being provided with strengthening means extending along the blades outward from a point adjacent the hub and ending short of the outer ends of the blades.

8. A rotary fan comprising a hub, and a plurality of radial blades formed of strips .of sheet metal each bent to V-shape to form two radial blades and having their intermediate or bent portions secured to the hub all in the same transverse plane, the intermediate portion of each strip'being secured to the hub on the side thereof from which the blade portions of such strip extend, and said blades being provided with strengthening means extending along the blades outward from a point'adjacent the hub.

In testimony whereof, I have hereunto set my hand in the presence of two subscribingwitnesses.

WILLIAM W. ROSENFIELD.

FRANK TRENHOLM. 

